Circuit Description

This test functions on the assumption that a sudden decrease in non-drive wheel speed must be caused by a brake application. Non-drive wheel speed and stoplight switch status are supplied to PCM through the serial data from EBTCM. If there is a 2.5 MPH or greater decrease of non-drive wheel speed in .2 second and a transition of the TCC or extended travel contacts of the TCC brake switch occurs without a transition of the stoplight switch, DTC will set.